Cream of mushroom soup, red tomato mushroom sauce with or without meat, gravies (make gravy by adding stock and wine of choice. drippings from meat to be served with can be added at reheat and service). All can be prepped then frozen in containers for quick meals/use later.

I've frozen canned jalapeno peppers. A friend of mine freezes canned cream of mushroom soup...not in the can, I freeze tomato paste, and I will sautee fresh mushrooms (and leeks, and onions, not together, separately) and freeze them...they work for pizza, soups, sauces.